EP-4738270-A1 - DIGITAL GENERATION METHOD AND APPARATUS FOR DENTAL BRACES, DEVICE AND MEDIUM

EP4738270A1EP 4738270 A1EP4738270 A1EP 4738270A1EP-4738270-A1

Abstract

The present disclosure relates to a digital generation method for dental appliances, apparatus, device, and storage medium. The method includes: acquiring an original three-dimensional (3D) tooth model; adjusting the orientation of the original 3D tooth model continuously, calculating an area of an undercut region of teeth in the original 3D tooth model during each adjustment, and stopping the adjustment and determining an undercut direction until the area of the undercut region meets a preset condition; identifying tooth feature points of each tooth in the original 3D tooth model; generating an edge line on the original 3D tooth model based on a plurality of the tooth feature points; generating a digital model of the dental appliances corresponding to the original 3D tooth model according to the undercut direction, the edge line and preset undercut parameters. The present disclosure may improve the efficiency of generating the digital model of dental appliances.

Inventors

CHEN, YUE
JIANG, Tengfei
LU, YAN
YU, Zhongyu
LIU, Wenqi
CHEN, XUDONG
LIU, YING
LI, JUN

Assignees

Shining 3D Tech Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20240531

Claims (10)

A digital generation method for dental appliances, characterized by comprising: acquiring an original three-dimensional 3D tooth model; adjusting the orientation of the original 3D tooth model continuously, calculating an area of an undercut region of teeth in the original 3D tooth model during each adjustment, and stopping the adjustment and determining an undercut direction until the area of the undercut region meets a preset condition; identifying tooth feature points of each tooth in the original 3D tooth model; generating an edge line on the original 3D tooth model based on a plurality of the tooth feature points; generating a digital model of the dental appliances corresponding to the original 3D tooth model according to the undercut direction, the edge line and preset undercut parameters.
The method according to claim 1, characterized in that stopping the adjustment until the area of the undercut region meets the preset condition comprise: determining area weighted average value of the undercut regions of multiple teeth according to the undercut regions of each tooth in the original 3D tooth model and preset weighting coefficient of each tooth; determining whether the area weighted average value meets the preset condition, wherein the preset condition comprises the area weighted average value is minimum value, or the area weighted average value is less than a preset area threshold; if the area weighted average value meets the preset condition, stopping adjusting the orientation of the original 3D tooth model and maintaining the current orientation.
The method according to claim 1, characterized in that determining the undercut direction comprises: For any tooth in the original 3D tooth model, forming a coordinate system with mesiodistal direction, buccolingual direction and long axis direction as coordinate axis directions, and a center point of any tooth as a coordinate origin, and calculating a direction of any tooth in the coordinate system; determining the average value of the directions of teeth in the 3D teeth as the undercut direction.
The method according to claim 1, characterized in that identifying the tooth feature points of each tooth in the original 3D tooth model comprises: obtaining the tooth feature points of each tooth at target positions by identifying buccolingual feature points in each tooth through a preset recognition model, wherein the target positions comprise buccolingual cervical point of the crown and buccolingual gingival papilla point.
The method according to claim 4, characterized in that generating the edge line on the original 3D tooth model based on the plurality of the tooth feature points comprises: generating edge line with a straight-line type on the original 3D tooth model based on the tooth feature points at the buccolingual cervical point of the crown; or, generating edge line with a curve-type on the original 3D tooth model based on the tooth feature points at the buccolingual cervical point of the crown and the tooth feature points at the buccolingual gingival papilla points.
The method according to claim 1, characterized in that the undercut parameters comprises undercut filling ratio, model thickness, and relief space parameters between the model and the dentognathic jaw; generating the digital model of the dental appliances corresponding to the original 3D tooth model according to the undercut direction, the edge line, and the preset undercut parameters comprises: obtaining a target 3D tooth model by filling the undercut region of the original 3D tooth model according to the undercut filling ratio; taking the undercut direction as an insertion path direction of the digital model of the dental appliances to be generated; obtaining a target mesh by performing mesh extraction on the target 3D tooth model according to the insertion path direction and with the edge line as the boundary line; generating the digital model of the dental appliances corresponding to the original 3D tooth model by performing surface reconstruction on the target mesh according to a voxel method, the model thickness, and the relief space parameters between the model and the dentognathic jaw.
The method according to claim 1, characterized in that before generating the digital model of the dental appliances corresponding to the original 3D tooth model according to the undercut direction, the edge line and the preset undercut parameters, the method comprises: acquiring preset user information, wherein the user information is used to indicate that the type of the edge line to be generated is a straight line type or a curve type, and values of the preset undercut parameters.
A digital generation apparatus for dental appliances, characterized by comprising: a model acquisition module configured to acquire an original three-dimensional 3D tooth model; an undercut direction determination module configured to adjust the orientation of the original 3D tooth model continuously, calculate an area of an undercut region of teeth in the original 3D tooth model during each adjustment, and stop the adjustment and determine an undercut direction until the area of the undercut region meets a preset condition; a feature recognition module configured to identify tooth feature points of each tooth in the original 3D tooth model; an edge line generation module configured to generate an edge line on the original 3D tooth model based on a plurality of the tooth feature points; a model generation module configured to generate a digital model of the dental appliances corresponding to the original 3D tooth model according to the undercut direction, the edge line and preset undercut parameters.
An electronic device, characterized by comprising: a processor; a memory for storing executable instructions of the processor; the processor configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of claims 1-7.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores instructions, and when the instructions run on a terminal device, the terminal device is enabled to implement the method according to any one of claims 1-7.

Description

The disclosure claims the priority of the Chinese patent application NO. 202310800175.X, which is filed with the China National Intellectual Property Administration on June 30, 2023 and the title "Digital Generation Method for Dental Appliances, Apparatus, Device and Storage Medium", which is incorporated by reference in its entirety. TECHNICAL FIELD The present disclosure relates to the technical field of intelligent stomatology, more specifically, to a digital generation method for dental appliances, apparatus, device and storage medium. BACKGROUND With the popularization of digitalization in dentistry, the production of dental products, such as night guards and orthodontic retainers, using 3D printing has gradually become widespread. The generation of digital models for dental products may require numerous parameters, for example, the direction of undercuts, the position of edge lines, etc. Currently, in the process from importing dentognathic data to generating dental products, it is necessary to manually set parameters described above step by step according to a specific procedure for generating the model. The processing for generating model is overly complex, which may not only incur learning costs but also require users to perform multiple interactive operations during each process, resulting in a cumbersome adjustment procedure and low efficiency. SUMMARY (1) Technical Problems The technical problem to be solved by the present disclosure is to address the issues existing in the current model generation process, such as complexity, high learning costs, cumbersome adjustment procedures, and low efficiency. (2) Technical Solutions In order to address the above-mentioned technical problems, the embodiments of the present disclosure provide a digital generation method of dental appliances, apparatus, device, and storage medium. According to one aspect of the present disclosure, a digital generation method of dental appliances is provided. The method may include: acquiring an original three-dimensional (3D) tooth model;adjusting the orientation of the original 3D tooth model continuously, calculating an area of an undercut region of teeth in the original 3D tooth model during each adjustment, and stopping the adjustment and determining an undercut direction until the area of the undercut region meets a preset condition;identifying tooth feature points of each tooth in the original 3D tooth model;generating an edge line on the original 3D tooth model based on a plurality of the tooth feature points;generating a digital model of the dental appliances corresponding to the original 3D tooth model according to the undercut direction, the edge line and preset undercut parameters. According to another aspect of the present disclosure, a digital generation apparatus of dental appliances is provided. the digital generation apparatus may include: a model acquisition module configured to acquire an original three-dimensional (3D) tooth model;an undercut direction determination module configured to adjust the orientation of the original 3D tooth model continuously, calculate an area of an undercut region of teeth in the original 3D tooth model during each adjustment, and stop the adjustment and determine an undercut direction until the area of the undercut region meets a preset condition;a feature recognition module configured to identify tooth feature points of each tooth in the original 3D tooth model;an edge line generation module configured to generate an edge line on the original 3D tooth model based on a plurality of the tooth feature points;a model generation module configured to generate a digital model of the dental appliances corresponding to the original 3D tooth model according to the undercut direction, the edge line and preset undercut parameters. According to another aspect of the present disclosure, an electronic device is provided. The electronic device may include: a processor;a memory for storing executable instructions of the processor;the processor is configured to read executable instructions from the memory and execute the instructions to implement the method described above. According to another aspect of the present disclosure, a computer-readable storage medium is provided, which stores a computer program, and the computer program is used to execute the method described above. (III) Beneficial Effects Compared with the existing technology, the above technical solutions provided by the embodiments of the present disclosure have the following advantages: The digital generation method of the dental appliances, apparatus, device, and storage medium provided by the embodiments of the present disclosure may include: for the obtained original three-dimensional (3D) tooth model, firstly, adjusting continuously the orientation of the original 3D tooth model, and calculating the area of the undercut region of the teeth in the original 3D tooth model during each adjustment; stopping the adjustment and